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Can Squirrels Eat Through Walls? Through Most of Them

Timber, plasterboard, soffit, lead flashing and thin aluminium all give way. What actually stops them, and where they get in first.

By Salma 2 min read Save to Pinterest — opens Pinterest in a new tab
Displaced roof tiles leaving an open gap at the eaves of a white building
Photo: Dx21, Pixabay Content License, via Pixabay
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A squirrel’s incisors grow continuously and are backed by a jaw designed to open hickory nuts. Against that, most of what a house is clad in is soft.

What holds and what does not

materialstops a squirrel
Masonry, concreteyes
Sheet steelyes
Galvanised steel mesh, ≤12 mmyes
Hardwood, thick timberslows them
Plywood, OSB, soffit boardno
uPVC, aluminium flyscreenno
Lead flashingno
Expanding foamno
Plastic mesh, chicken wireno

Where to look first

locationwhy
Soffit and fascia jointsexisting gap, soft board
Gable and eaves ventsmesh is usually plastic
Roof-pitch changes at an extensionflashing lifts
Ridge ends and loose tilesopen by design or by age
Where a branch overhangs the roofthe access route

Do not seal while anything is inside

Squirrels are diurnal, so watch the roofline at dawn. A sealed-in animal chews outward through something worse, or dies in the cavity. A one-way exclusion door over the hole is the correct sequence: fit it, confirm no activity for several days, then repair permanently.

A repair that lasts

  • Cut back branches within about 2.5 m of the roof — that removes the route
  • Galvanised steel mesh, 12 mm or finer, screwed behind the damaged board or bedded in mortar
  • Replace chewed soffit rather than patching, and back it with mesh
  • Metal vent covers in place of plastic
  • Check the loft wiring before you close it up

One hole means check for three

An established route is rarely a single opening. Walk the whole roofline with binoculars from the ground before repairing anything, and fix every gap in the same visit.

Common questions

Can a squirrel chew through a wall?

Through most residential wall materials, yes. Timber cladding, plywood, OSB, plasterboard, soffit and fascia board, uPVC, lead flashing and thin aluminium are all within reach of a squirrel's incisors, which grow continuously and are backed by a jaw built for cracking nuts. What they cannot work through is masonry, concrete, properly bedded metal flashing and heavy-gauge steel mesh.

Can they come through a ceiling?

Plasterboard ceilings can be chewed or simply broken through, and it happens — usually when an animal in the roof space is trapped, panicked or following a water leak that has already softened the board. It is far less common than roof-space entry, because a squirrel in an attic has no reason to go downward into a room it cannot leave.

Where do they usually get in?

At the roofline, almost always. Soffit and fascia joints, gable vents, the gap where a roof meets an extension at a different pitch, loose or missing tiles, ridge ends, and the openings around eaves. These are already gaps; the squirrel enlarges them rather than starting a hole in flat material. A gap of about 4–5 cm is enough for a grey.

What materials actually stop them?

Heavy-gauge galvanised steel mesh of 12 mm or smaller aperture, sheet steel, masonry and concrete. Expanding foam, plastic mesh, chicken wire, aluminium flyscreen and wood fillers are chewed through quickly — foam in particular is sometimes recommended and is close to useless on its own. Steel mesh bedded into mortar or screwed behind a timber batten is the durable repair.

How do I know whether anything is still inside?

Watch at first light. Tree squirrels are strictly diurnal, so they leave shortly after dawn and return before dusk. Sealing an occupied roof space traps an animal that will then chew outward through something more expensive, or die in the cavity. A one-way exclusion door fitted over the entry hole lets them leave and not return.

Is the damage only cosmetic?

No. The chewing is the smaller cost. Squirrels in a roof space strip and gnaw cable insulation, compress and foul insulation, and bring in nesting material — which is why the real risk of an untreated roof-space infestation is electrical. If there is evidence of chewed wiring, that is an electrician's job before anything else.

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